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1: Active solar heating system 2: Bird abatement 3: Soil 4: Community 5: Weed 6: Range 7: Periplaneta americana 8: Lead 9: Japan 10: Feeder 11: Contamination 12: Maximum mid-expiratory flow rate 13: Process 14: Change 15: Electricity 16: Development 17: Function 18: Fishery 19: Action 20: Atmosphere (As of 14:37)